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15 papers · 2 filters
Supermassive Black Holes from the SUNNS survey
Marc Sarzi, Hans-Walter Rix, Joseph C. Shields +5
We report three new accurate mass measurements for the supermassive black holes hosted by the early-type disk galaxies NGC2787, NGC4459 and NGC4596. The targets were selected from…
A Young Stellar Cluster in the Nucleus of NGC 4449
T. Boeker, R. P. van der Marel, L. Mazzuca +4
We have obtained 1-2 A resolution optical Echellette spectra of the nuclear star cluster in the nearby starburst galaxy NGC 4449. The light is clearly dominated by a very young (6-…
Evidence for a Supermassive Black Hole in the S0 Galaxy NGC 3245
A. J. Barth, M. Sarzi, H. -W. Rix +3
The S0 galaxy NGC 3245 contains a circumnuclear disk of ionized gas and dust with a radius of 1.1" (110 pc), making it an ideal target for dynamical studies with the Hubble Space T…
SuperMassive Black Holes in Bulges
Marc Sarzi, Hans-Walter Rix, Joseph C. Shields +5
We present spatially extended gas kinematics at parsec-scale resolution for the nuclear regions of four nearby disk galaxies, and model them as rotation of a gas disk in the joint…
Variability in LINERs
J. C. Shields, H. -W. Rix, D. H. McIntosh +6
A small number of LINERs have been seen to display variable H-alpha emission with a very broad, double-peaked profile. Recent observations with the Hubble Space Telescope indicate…
The Broad-Line and Narrow-Line Regions of the LINER NGC 4579
A. J. Barth, L. C. Ho, A. V. Filippenko +2
We report the discovery of an extremely broad H-alpha emission line in the LINER nucleus of NGC 4579. From ground-based observations, the galaxy was previously known to contain a T…
Hard X-ray Emission and the Ionizing Source in LINERs
Yuichi Terashima, Luis C. Ho, Andrew F. Ptak
We report X-ray fluxes in the 2--10 keV band from LINERs (low-ionization nuclear emission-line regions) and low-luminosity Seyfert galaxies obtained with the ASCA satellite. Observ…
Black Hole Mass Estimates from Reverberation Mapping and from Spatially Resolved Kinematics
Karl Gebhardt, John Kormendy, Luis Ho +12
Black hole (BH) masses that have been measured by reverberation mapping in active galaxies fall significantly below the correlation between bulge luminosity and BH mass determined…
A Relationship Between Nuclear Black Hole Mass and Galaxy Velocity Dispersion
Karl Gebhardt, Ralf Bender, Gary Bower +12
We describe a correlation between the mass M_BH of a galaxy's central black hole and the luminosity-weighted line-of-sight velocity dispersion sigma_e within the half-light radius.…
Detailed Analysis of Early to Late-Time Spectra of Supernova 1993J
Thomas Matheson, Alexei V. Filippenko, Luis C. Ho +2
We present a detailed study of line structure in early to late-time spectra of Supernova (SN) 1993J. Spectra during the nebular phase, but within the first two years after explosio…
Optical Spectroscopy of Supernova 1993J During Its First 2500 Days
T. Matheson, A. V. Filippenko, A. J. Barth +15
We present 42 low-resolution spectra of Supernova (SN) 1993J, our complete collection from the Lick and Keck Observatories, from day 3 after explosion to day 2454, as well as one K…
Radio Sources in Low-Luminosity Active Galactic Nuclei. I. VLA Detections of Compact, Flat-Spectrum Cores
Neil M. Nagar, Heino Falcke, Andrew S. Wilson +1
We report a 0.2" resolution, 15 GHz survey of a sample of 48 low-luminosity active galactic nuclei with the Very Large Array. Compact radio emission has been detected in 57% (17 of…
Double-Peaked Broad Emission Lines in NGC 4450 and Other LINERs
Luis C. Ho, Greg Rudnick, Hans-Walter Rix +5
Spectra taken with HST reveal that NGC 4450 emits Balmer emission lines with displaced double peaks and extremely high-velocity wings. This characteristic line profile, previously…
Supermassive Black Holes in Inactive Galaxies
John Kormendy, Luis C. Ho
This article discusses stellar dynamical evidence for supermassive black holes in inactive and weakly active galaxies.
Supermassive Black Holes in Active Galactic Nuclei
Luis C. Ho, John Kormendy
This article gives a brief overview of the direct and indirect evidence in support of the standard paradigm that active galactic nuclei are powered by supermassive black holes.